A:AnswerThis unit is intended for use with Windows 10 or Linux based PCs. It is not directly compatible with a cell phone via a USB adapter. https://www.asus.com/us/Networking/USB-BT500/specifications/
A:AnswerYes, that product appears to support PC Bluetooth pairing. https://support.apple.com/en-us/HT209544
Please verify that your PC is running either Windows 10 or Linux, and you shouldn't have any issues.
A:AnswerThis unit is intended for use with PCs. I recommend contacting Vizio directly to see if your TV is compatible with this device. https://www.asus.com/us/Networking/USB-BT500/specifications/